Impact of having a large number of open file descriptors

[Ivan Voras]

Hi,

Im thinking again of the old idea of implementing poor man's file
replication system using kqueue to monitor changes on files. This would
require opening every file that needs to be monitored and using
EVFILT_VNODE to monitor them. I suppose this would work for a small-ish
number of files like for a user's home directory but what about 100,000
files or millions of files?

One other question: do kqueue events "coalesce" in the sense that if N
operations happen (like write()s), there can be < N events passed to the
kqueue (NOTE_WRITE)?

While at it, will EVFILT_VNODE and NOTE_WRITE catch "additional" ways
the file can be modified, meaning mmap()?

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